ERV envelope on lymphocytes was detected as previously described (42 (link); b)using an anti-MLV envelope antibody clone 83A25 (kindly provided by Leonard Evans, NIH) (41 (link)). The following antibodies were used for staining of vaginal dendritic cells: Fixable Aqua Dead Cell Stain Kit (Thermo Fisher), CD45 (clone 30-F11, BioLegend), CD11b (clone M1/70, BioLegend), and CD11c (clone N418, BioLegend). All cells were stained in 1% BSA PBS and incubated on ice for 15 to 20 minutes. Cells were acquired on BD LSRII cytometer and analyzed by FlowJo software v8.8.7 (Tree Star, Inc.).
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